Abstract: A water bed illuminator in which the bed includes a rectangular box-like base having a longitudinally extending central support wall spaced equidistantly from each opposite side wall, and three laterally extending support walls spaced apart equidistantly between each opposite end wall, to form six separate compartments. A light fixture is placed in the center of each compartment, connected to an electric power source by an insulated conductor, with an electric switch connected therein to turn the lights on and off. A mattress box is positioned on the base, having a floor in which six holes are cut at locations which are in registration with respective ones of the light fixtures. The waterbed mattress comprises a transparent or translucent water tight rectangular container which forms a mattress when filled with water. When placed in the mattress box and the light fixtures are turned on, the mattress becomes illuminated.